using StellaOps.Notify.Queue;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;

namespace StellaOps.Notifier.WebService.Setup;

/// <summary>
/// No-op event queue used when a real queue backend is not configured (dev/test/offline).
/// </summary>
public sealed class NullNotifyEventQueue : INotifyEventQueue
{
    public ValueTask<NotifyQueueEnqueueResult> PublishAsync(NotifyQueueEventMessage message, CancellationToken cancellationToken = default) =>
        ValueTask.FromResult(new NotifyQueueEnqueueResult("null", false));

    public ValueTask<IReadOnlyList<INotifyQueueLease<NotifyQueueEventMessage>>> LeaseAsync(NotifyQueueLeaseRequest request, CancellationToken cancellationToken = default) =>
        ValueTask.FromResult<IReadOnlyList<INotifyQueueLease<NotifyQueueEventMessage>>>(Array.Empty<INotifyQueueLease<NotifyQueueEventMessage>>());

    public ValueTask<IReadOnlyList<INotifyQueueLease<NotifyQueueEventMessage>>> ClaimExpiredAsync(NotifyQueueClaimOptions options, CancellationToken cancellationToken = default) =>
        ValueTask.FromResult<IReadOnlyList<INotifyQueueLease<NotifyQueueEventMessage>>>(Array.Empty<INotifyQueueLease<NotifyQueueEventMessage>>());
}